需求：

假設w輸出類似這樣

user1?? pts/0??? ...................... -bash

user1??? pts/1??? ...................... -bash

user2??? pts/2?? ...................... -bash

user2??? pts/3??? ...................... w

有沒有命令對指定的tty注銷用戶？又有沒有命令對指定的用戶注銷所有tty？

總感覺用ps kill -9 太暴力了點，也不方便......

其實可以通過skill命令來實現:

# skill

Usage:?? skill [signal to send] [options] process selection criteria

Example: skill -KILL -v pts/*

The default signal is TERM. Use -l or -L to list available signals.

Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0.

Alternate signals may be specified in three ways: -SIGKILL -KILL -9

General options:

-f? fast mode??????????? This is not currently useful.

-i? interactive use????? You will be asked to approve each action.

-v? verbose output?????? Display information about selected processes.

-w? warnings enabled???? This is not currently useful.

-n? no action??????????? This only displays the process ID.

Selection criteria can be: terminal, user, pid, command.

The options below may be used to ensure correct interpretation.

-t? The next argument is a terminal (tty or pty).

-u? The next argument is a username.

-p? The next argument is a process ID number.

-c? The next argument is a command name.

-t 這個參數可以多利用

總結

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